Alopecia Areata

Alopecia areata is a type of hair loss that occurs when the immune system mistakenly attacks hair follicle roots, where hair growth begins. It is most common in people younger than 20, but children and adults of any age may be affected.

Usually clumps of hair fall out, resulting in totally smooth, round hairless patches. In some cases the hair may become thinner without distinct patches of baldness. This may happen several times.

In rare cases, complete loss of scalp hair and body hair occurs.

Hair may regrow completely, partially, or not at all. In most people with the condition, the hair regrows within a year.

Medical treatments for alopecia areata may include medications that are either put on the scalp or injected. Because hair often regrows, treatment may not be necessary.

By

Healthwise Staff

Primary Medical Reviewer

Adam Husney, MD - Family Medicine

Specialist Medical Reviewer

E. Gregory Thompson, MD - Internal Medicine

Last Revised

May 29, 2012

eMedicineHealth Medical Reference from Healthwise

This information does not replace the advice of a doctor. Healthwise disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.